Loathesome quasi-literates

Perhaps this doesn’t bother anyone else. But I swear, is there is anything quite so annoying as correspondence from presumably literate people signed: “Best”? Best what? Best wishes? Best of luck? Best watch out because I’m planning to chain you up naked against the wall in my stone-lined pit of sex slaves? From what I’ve seen in my emails, it seems as if started out as a New York thing, so naturally it’s spread as others slavishly ape what they think is ever so spiffy and sophisticated.